Arc welding control method

Abstract

An arc welding control method includes: feeding a welding wire; and repeating a short-circuit period and an arc period, where the arc period includes a first arc period and a second arc period following the first arc period. A welding current is applied using constant current control during the first arc period, and the welding current is applied using constant voltage control during the second arc period. The first arc period is set to an electrode-negative polarity, and a period other than the first arc period is set to an electrode-positive polarity.

1 . An arc welding control method comprising:
 feeding a welding wire; and   repeating a short-circuit period and an arc period, the arc period comprising a first arc period and a second arc period following the first arc period,   wherein a welding current is applied using constant current control during the first arc period,   the welding current is applied using constant voltage control during the second arc period, and   the first arc period is set to an electrode-negative polarity, and a period other than the first arc period is set to an electrode-positive polarity.   
     
     
         2 . The arc welding control method according to  claim 1 , wherein switching to the electrode-negative polarity is made at a start of the first arc period or at a delayed time from the start of the first arc period. 
     
     
         3 . The arc welding control method according to  claim 1 , wherein switching to the electrode-negative polarity is made at a time in the short-circuit period. 
     
     
         4 . The arc welding control method according to  claim 1 , wherein polarity switching is made while an absolute value of the welding current is equal to or smaller than a reference value. 
     
     
         5 . The arc welding control method according to  claim 1 , wherein the welding wire is fed backward during the short-circuit period and fed forward during the arc period.